From 44f141dd24bf20b0e20b86c3cd644c6873fb5bcc Mon Sep 17 00:00:00 2001
From: Shannon Booth <shannon.ml.booth@gmail.com>
Date: Mon, 3 Jul 2023 18:07:45 +1200
Subject: [PATCH] LibDiff: Add Diff::write_context_header

This is used to write a context patch header.
---
 Userland/Libraries/LibDiff/Format.cpp | 8 ++++++++
 Userland/Libraries/LibDiff/Format.h   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibDiff/Format.cpp b/Userland/Libraries/LibDiff/Format.cpp
index 6417f6f9a5..f3c4c1c7ce 100644
--- a/Userland/Libraries/LibDiff/Format.cpp
+++ b/Userland/Libraries/LibDiff/Format.cpp
@@ -210,4 +210,12 @@ ErrorOr<void> write_context(Hunk const& hunk, Stream& stream, ColorOutput color_
     return write_hunk_as_context(split_lines.old_lines, split_lines.new_lines, hunk.location, stream, color_output);
 }
 
+ErrorOr<void> write_context_header(StringView old_path, StringView new_path, Stream& stream)
+{
+    TRY(stream.write_formatted("*** {}\n", old_path));
+    TRY(stream.write_formatted("--- {}\n", new_path));
+
+    return stream.write_formatted("***************\n");
+}
+
 }
diff --git a/Userland/Libraries/LibDiff/Format.h b/Userland/Libraries/LibDiff/Format.h
index a80d2fbb26..f6a83627a2 100644
--- a/Userland/Libraries/LibDiff/Format.h
+++ b/Userland/Libraries/LibDiff/Format.h
@@ -26,4 +26,5 @@ ErrorOr<void> write_unified_header(StringView old_path, StringView new_path, Str
 ErrorOr<void> write_normal(Hunk const& hunk, Stream& stream, ColorOutput color_output = ColorOutput::No);
 
 ErrorOr<void> write_context(Hunk const& hunk, Stream& stream, ColorOutput color_output = ColorOutput::No);
+ErrorOr<void> write_context_header(StringView old_path, StringView new_path, Stream& stream);
 }